Portable heater for heating rivets, &amp;c.



whi

JOHN

rseenieaocz ser e, 1.90s I UNITED. STATES PATENT OFFICE.

MAC DONALD AX D Tl lO-ZllAS M ACDONALD, O l GLASGOW, SCOTLAN D.

PORTABLE HEATER ren HEA'llNG Rivers, aw.

SPECfiICATION forining 'Of Letters-Patent No. 750,670, dated. October 8, 1903.

Application filed Kay 6. 19-03. Serial liolfxiiilQ. Clio model.) v

, To all whom it may concern:

Be it known that. we, JOHN MACDONALD and Tnoius Mncooxnpo, engineers, subjects of the King of Great Britain, residing at 2) York street, Glasgow, Scotland, have invented cortnin new and' useful Improvements in Portable liez icrs or Forges for llenting Rivets and for Such Like Purposes, of which the fol- V lowing is a specification.

This invention relates to portable healers" or forges forhentiug rivets and for such like purposes.

At present portable rivebheaiers are usu ally provided with no air-blast produced by the action of a bellows or the operation of a fnnor blowexn- It has been proposed to do 3-way with the bellows and fan and introduce a jet of compressed air direct to the twyer, the compressed air being drawn from any suitable or convenient air-compressing npparntus. It may be pointed out that while the use of n compressed-air jet directed' into the tivyer as aforesaid obviates the necessity for employing a boy to operate a fan or bellows, and thus far results'in economy, yet great waste occurs through the large amount of compressed air which has to be used in or.- der to produce an ofiicieut blast. The result "is that the economy in labor is more than counterbalanced bythe waste of compressed. air. z I

Under our invention we propose to use a. an or air-propeller and operate said fan or propeller by means of n'smal'l jet of compressed air,with the result thatwhile the services of a boy for operatingthe fan are dispensed with onlya com paratively small qunntity of compressed air is used.

In order that our invention may he properly understood, we have hereunto appended two sheets of drawings, whereon is shown, by way of example, a portable rivet-hesier,such as used in ship-yards, said heater being con structed with our improvements. Figural is aside elevation of the rivetheater. Fig. 2 is a section through the fan- Fig. 3 shows the compressed-air nozzle full size. Fl 4 is a. longitudinal section of same.

The rivet-hearth a is made of and circular, as usual.

sheet metal a represents the supporting-legs. The

sides I: are pre the from. part (1 represents e is the nirblastpipe lending f is a rotaryiern'hly carried up higher than c. thcusunllwyerin dotted lines.

to the twyer. fun or nib-propeller arranged below the hearth and adapted to deliver the air-current int 0 the pipe e.

- g is the casing of the fan, and]: the nir-inlet opening in the casing.

The fun may be of any vell-known and soil-able construction and with radial or other blades or vanes. The inn shown on the drawings has eight radial vanes. Atlhe top of the casing is a pop "with an inclined and tapped hole, into which s 1', made is screwed a nozzle 7, said nozzle having a passage-way 1 for the air-admission valve.

sion valve pro spindle o,

in it, forming-atone end ascat The nimuimis- 7o fernhly consists of a needle or working in a casing p, which may be screwed to the nozzle and which is provided with a branch 11, com-prcssednir-supply pipe 7:. 0, one end of which terminates in connected with the The spindle '75 the valve 0', is screwednt q and has fitted to it a disk or wheel 1, (provided with nix-external flange or rim 1",) by and the distan means of which it can be turned on of the valve 0' from the-seat 8o varied, thereby regulating the quantity of air admittedto t-he fanf. larger at the screwed and q,

The spindle o ismade so that when desired it can be readily 'winhdrawn from the .cn'singp for cleansing The method or other purposes.

of fitting the several parts together will be easily understood without further explanation, as th-edrnwings show everything qnite clearly.

When the compressed air is turned on by go opening the valve with considers 0 a'fine jet of air issues his force from the nozzle j andimpinges on the vanes of the fan, propelling it around very rapidly. the fan draws air in through and forces in up the pipe e and .twyer.

The fan can The revolution of the opening h 5 through the be started and stopped when desired by manipulating the air-cock n or valve 0 0' paused with.

If desired, the cock n'may be dis- The rivet-heater is preferably made: with out side handles.

Having now fully described our inven lion,-

what. we claim, and desire to secure by Letters l Patent, is-

I. In a portable heater or forge for heating rirets and for such like purposes the combi- 5 nation with the tir er of a fun or air-propeller for delivering an air-bloat to the twyerand means whereby the fan or propeller can be rotated byrt jet of compressed air which is caused to impinge on the blades of the fan. v

i. In a portable heater or forge the combination with the hearth and the twyer ofa rotary fan for delivering an air-blast. to the twyer, an air-nozzle arranged in the casing of the fan and adapted to delivera jet, of compressed air against the-blades of the fan, and

means for supplying compressed air to the nozzle.

3. In a protable heater or forge the combination with the hearth and the twyer of a rotary inn for delivering an hir-hlnst to the twyeqnn air-nozzle arranged in the casing of the, fan and adapted to deliver a jet of compressed air agninet the blades of the fztn, means for controlling the passage of air :5 through the nozzle, and means forsupplying compressed air to the nozzle.

4. 'In a portable heater or forge the combination with the hearth and the tw'yer of a rotary fan for delivering an air-blast to the twycna valve-casing provided with a nozzle arranged in thecasingot' the t'an,aneedle-\-'alve armnged within the valve-casing, means for manipulating the valve, and means for supplying compressed air to the valve.

5. In combination, the hearth, the twyer,

a rotary fan for delivering an air-blast to the twyen'tt ensingsu-rrennding the the, a nozzle screwed into. the casing, a valve: casing screwed onto the nozzle, a. needle valve arranged within the vniveeesing and adopted 49 to close the oritieeof thenozzle, nert-n5 for V manipulating the valve, and means {or sup plying compressed air to the vaivecasing.

6. In-eot-nbintition, the hearth, the twyer, ni'an nrrnngetl below the hearth and adapted to rotate within a casing, a bhistpipe leading from the casing: of the t'n-u to the t-wyer, an air-outlet at the side of the fancasing, a pop on the casing, 11 needle-valve provided with a serevied nozzle inserted in the pop, menus for manipnlating the needlevnlve and means for supplying compressed air tothc valve, substantially as hereinbefore described;

7. In a. portable heater or forge, the combination with the hearth and the t t-yer, of a rotary fan for delivering an air-blast to the hryer, n valve-casing provided with a nozzle arranged in the casing oi the fan, a valve arranged Within the wtlVeensing, means for manipulating the valve, and means for supplying cotnprcssedair to the valve.

Signed at Glasgow, Scotland, this ltlt-hdny of April, 1903.

JOHN MACDONALD. THOMAS MACDONALD.

Witnesses:

Annxzmnnn MACDONALD, \VILLIAM WALK R. 

